I am a Front-End Developer with 3 years of experience building modern web applications focused on performance, usability, and user experience. I specialize in React and TypeScript, with hands-on experience leading website restyling projects, optimizing load times, and creating reusable components. I collaborate closely with design and business teams to deliver clear, scalable solutions. I redesigned the front-end architecture for corporate portals, contributing to decisions on architecture and user experience that led to a 25% improvement in usability, and I reduced load times by 20% through targeted performance optimizations and refactoring.

Miguel Castillo Olivares

I am a Front-End Developer with 3 years of experience building modern web applications focused on performance, usability, and user experience. I specialize in React and TypeScript, with hands-on experience leading website restyling projects, optimizing load times, and creating reusable components. I collaborate closely with design and business teams to deliver clear, scalable solutions. I redesigned the front-end architecture for corporate portals, contributing to decisions on architecture and user experience that led to a 25% improvement in usability, and I reduced load times by 20% through targeted performance optimizations and refactoring.

Available to hire

I am a Front-End Developer with 3 years of experience building modern web applications focused on performance, usability, and user experience. I specialize in React and TypeScript, with hands-on experience leading website restyling projects, optimizing load times, and creating reusable components.
I collaborate closely with design and business teams to deliver clear, scalable solutions. I redesigned the front-end architecture for corporate portals, contributing to decisions on architecture and user experience that led to a 25% improvement in usability, and I reduced load times by 20% through targeted performance optimizations and refactoring.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
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Language

Spanish; Castilian
Fluent
English
Fluent

Work Experience

Front-end Developer at SAPIENS
January 1, 2024 - July 18, 2025
Led a restyling project of a business portal, achieving a 35% improvement in usability and a 15% increase in user retention by implementing a modern and functional design. Restructured the code base in JavaScript, Bootstrap, and JQuery, reducing page load times by 30% through optimisation techniques. Designed and implemented custom components in React and TypeScript, ensuring a smooth and cross-browser user experience. Automated deployment pipelines in GitLab and configured production environments with AWS, reducing deployment times by 30%. Identified and resolved critical bugs in the Toyota Portal, improving system stability and scalability, contributing to a 20% increase in customer satisfaction.
Computer Technician at HM Hospitals
June 30, 2019 - July 18, 2025
Provided comprehensive technical support to more than 200 employees, resolving hardware and software issues in less than 24 hours on average, increasing internal productivity. Installed and configured specialized medical systems, improving operational efficiency by 15% in healthcare processes. Managed preventive and corrective maintenance tasks, ensuring minimal downtime of critical systems.
Front-End Developer at SAPIENS Technical Leadership
January 1, 2024 - September 28, 2025
Led styling project for a business portal, achieving a 35% improvement in usability and a 15% increase in user retention by implementing a modern, functional design. Performed performance optimization by restructuring the codebase in JavaScript, Bootstrap and jQuery to reduce page load times by 30%. Implemented React components, client-side architecture, and streamlined deployment workflows in AWS.
Computer Technician at HM Hospitals
January 1, 2019 - September 28, 2025
Provided comprehensive technical support to over 200 employees, resolving hardware and software issues in under 24 hours on average. Installed and configured specialized medical systems, improving operational efficiency in health care processes by 15%. Managed preventive and corrective maintenance tasks.
Front-End Developer at Sapiens Iberia
June 1, 2021 - June 1, 2024
Instalé y configuré sistemas médicos especializados, resolviendo incidencias de hardware y software en menos de 24 horas. Mejoré la eficiencia operativa en un 15% y optimicé procesos, reduciendo tiempos de resolución.
Front-End Developer at Sapien Siberia
June 1, 2021 - June 1, 2024
Played an active role in the technical specification and redesign of the corporate portal, contributing to decisions regarding architecture and user experience that led to a 25% improvement in usability. Proposed and implemented improvements to the JavaScript, Bootstrap and jQuery code, reducing load times by 20% through performance optimization and refactoring. Collaborated on the design of the front-end architecture and implemented reusable components using React and TypeScript, ensuring cross-platform compatibility and a consistent user experience. Participated in the definition and automation of CI/CD processes using GitLab in the configuration of AWS environments, helping to reduce deployment times by 15%. Analyzed and resolved critical incidents on the Toyota portal, providing technical solutions that improved system stability and increased customer satisfaction.
IT Technician at HM Hospitals
April 1, 2019 - June 30, 2019
Provided end-to-end technical support to over 200 employees, resolving hardware and software incidents within 24 hours. Installed and configured specialized medical systems, improving operational efficiency by 15%.

Education

Intermediate Grade Microcomputer System and Networks at Higher Training School
October 10, 2017 - May 30, 2020
Higher Degree Multiplatform Application Development at GMQ Centre for Higher Studies
September 3, 2019 - May 31, 2022
Intermediate Grade Microcomputer System and Networks at Higher Training School
January 1, 2017 - January 1, 2019
Higher Degree Multiplatform Application Development at GMQ Centre for Higher Studies
January 1, 2019 - January 1, 2021
Technical Skills Training at NUCLIO DIGITAL SCHOOL
January 1, 2024 - January 1, 2025
Grado Superior en Desarrollo de Aplicaciones Multiplataforma at GMQ Tech
January 1, 2019 - January 1, 2021
Grado Medio en Sistemas Microinformáticos y Redes at GMQ Tech
January 1, 2017 - January 1, 2019
Master en UX/UI Design at Nuclio Digital School
January 1, 2024 - January 1, 2025
Higher National Diploma in Multiplatform Application Development at GMQ Tech
January 1, 2019 - December 31, 2021
Intermediate Grade Microcomputer System and Networks at GMQ Tech
January 1, 2017 - December 31, 2019
Master's Degree in UX/UI Design at Nuclio Digital School
January 1, 2024 - December 31, 2025
Master’s Degree in UX/UI Design at Nuclio Digital School
January 1, 2024 - January 1, 2025
Higher National Diploma in Multiplatform Application Development at GMQTech
April 1, 2019 - June 1, 2019
Intermediate / Diploma in Microcomputer Systems and Networks at GMQTech
January 1, 2017 - January 1, 2019

Qualifications

Master UX UI Design
November 1, 2023 - March 31, 2025

Industry Experience

Software & Internet, Healthcare, Computers & Electronics, Professional Services, Media & Entertainment, Education, Other